• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a system for selecting a layer-2 adapter, which comprises a layer-3 packet demand extraction module, a destination layer-2 address acquisition module, a layer-2 adapter indicator acquisition module, a suitable layer-2 adapter identifier selecting module, a packet buffering module, and a packet scheduling module. The packet buffering module is used for buffering a received layer-3 packet. The layer-3 packet demand extraction module is used for reading the layer-3 packet, and extracting a demanded type and parameter value. The layer-2 adapter indicator acquisition module is used for acquiring a real-time indicator parameter value of each adapter. The suitable layer-2 adapter identifier selecting module calculates an adapter identifier and a layer-3 packet index. The destination layer-2 address acquisition module is used for acquiring a layer-2 address of each adapter associated with a destination layer-3 address. The packet scheduling module invokes an external layer-2 adaptive driver, and the layer-2 adaptive driver completes packet encapsulation and transmission. The present invention can solve the problem of resource waste of multiple links, and the links can be dynamically used in parallel.
    公开号:AU2012396638A1
    申请号:U2012396638
    申请日:2012-12-28
    公开日:2014-09-04
    发明作者:Feng Deng；Jinlin Wang；Lingfang Wang；Jiali You
    申请人:Institute of Acoustics of CAS；Beijing Intellix Technologies Co Ltd；
    IPC主号:H04L12-947
    专利说明:
    LAYER 2 ADAPTER SELECTING SYSTEM AND METHOD Field of the Invention The present invention relates to the field of network communications, 5 and particularly, relates to a Layer 2 adapter selecting system and method. Background of the Invention With the rapid development of internet, network operators generally deploy redundant links in consideration of network reliability, and the 10 redundant links have two types, namely homogeneous ones and heterogeneous ones. Whatever type of redundant links is adopted, the redundant links and original ones are not included within the same transmission path; and under normal conditions, only one of two or more links between a source and a destination runs normally, so, huge waste of 15 the link resources will be caused. If the redundant links are arranged in a network, multiple Layer 2 adapters need to be provided at the source and the destination, but the protocols used on the layers above Layer 2 are the same. In addition, multiple adapters have been provided in terminals in practice. 20 Accordingly, under packet switching manner, the problem of selecting the multiple Layer 2 adapters will occur. In the prior art, if the multiple Layer 2 adapters have the same Layer 3 address, then only one adapter is activated within a time period in the selecting process of the Layer 2 adapters, which leads to the waste of the link resources. 25 Summary of the Invention To overcome the problem that the selecting methods of the existing 1 Layer 2 adapters are prone to cause waste of link resources, the present invention provides a Layer 2 adapter selecting system and method. To fulfill the above-mentioned object, the present Layer 2 adapter selecting system includes: a Layer 3 packet requirements extracting 5 module, a destination Layer 2 address acquiring module, a Layer 2 adapter metric acquiring module, an appropriate Layer 2 adapter identifier selecting module, a packet caching module and a packet scheduling module; wherein, the packet caching module is configured to cache a received Layer 3 10 packet; the Layer 3 packet requirements extracting module is configured to read the Layer 3 packet from the packet caching module, extract the type and parameter value of a requirements from the Layer 3 packet and transmit the obtained results to the appropriate Layer 2 adapter identifier 15 selecting module; the Layer 2 adapter metric acquiring module is configured to acquire instant metric parameter values of each of the adapters and transmit the obtained results to the appropriate Layer 2 adapter identifier selecting module; 20 the appropriate Layer 2 adapter identifier selecting module calculates an adapter identifier and a Layer 3 packet metric according to the type and parameter value of the requirements calculated by the Layer 3 packet requirements extracting module and each adapter metric value calculated by the Layer 2 adapter metric acquiring module, transmits the 25 resulted adapter identifier and the Layer 3 packet metric to the packet scheduling module, determines the link corresponding to the adapter is a unidirectional link or a bidirectional link according to the obtained 2 adapter identifier, and if the link is a unidirectional link, then performs parameter negotiation through a bidirectional link to obtain a unidirectional link destination address mapping parameter, and transmits the mapping parameter to an external destination Layer 2 adapter through 5 the bidirectional link; the destination Layer 2 address acquiring module is configured to acquire a Layer 2 address of each of the adapters associated with a destination Layer 3 address; the packet scheduling module calls an external Layer 2 adapter 10 driver according to the adapter identifier and Layer 3 packet metric obtained by the appropriate Layer 2 adapter identifier selecting module, wherein the Layer 2 adapter driver performs packaging and sending of the packet. In the above technical solution, when the destination Layer 2 address 15 acquiring module acquires the Layer 2 address of a destination adapter, if a data link is a bidirectional link, the source adapter interacts with the destination adapter through a Layer 2 data frame to obtain the Layer 2 address of the destination adapter; and if a data link is a unidirectional link, then the source and destination of another bidirectional link perform 20 parameter negotiation to obtain a mapping parameter of the unidirectional link destination, after which the source transmits the mapping parameter of the unidirectional link destination to the destination through the bidirectional link. In the above technical solution, the requirements is an metric to be 25 satisfied for the packet transmission. The present invention also provides a Layer 2 adapter selecting method implemented on the present Layer 2 adapter selecting system, 3 which includes: Step 1): after a Layer 3 packet is received, extracting the requirements from the received Layer 3 packet to obtain the type and the parameter value of the requirements; 5 step 2): acquiring the instant metric parameter values of each of the adapters; step 3): calculating an adapter identifier and a Layer 3 packet metric according to the type and parameter value of the requirements obtained in step 1) and the metric parameter values of each of the adapters obtained 10 in step 2); step 4): scheduling the Layer 3 packet according to the adapter identifier and Layer 3 packet metric obtained in step 3) so as to call a corresponding Layer 2 adapter driver; step 5): judging the link corresponding to each of the adapters is a 15 unidirectional link or a bidirectional link, if the link is a unidirectional link, executing step 6), otherwise, executing step 7); step 6): performing parameter negotiation through the source and the destination of a bidirectional link to obtain a unidirectional link destination address mapping parameter, after which the source sending 20 the obtained address mapping parameter to a destination Layer 2 adapter through the bidirectional link, and then executing step 8); step 7): the source adapter and the destination adapter interacting with each other through a Layer 2 data frame, so as to obtain a Layer 2 address of the destination adapter; 25 step 8): the Layer 2 adapter driver of the source adapter performing the packaging and sending of the packet. In the above method, step 1) includes: 4 step 1-1): extracting the requirements field from the header of the Layer 3 packet; step 1-2): extracting the type of the requirements from the requirements field, and if the requirements is of a single type, then 5 decomposing the requirements field to obtain a single parameter; and if the requirements is of a composite type, then decomposing the requirements field to obtain a plurality of parameters, further running an algorithm involving each of the obtained parameters to obtain a single dimensionless value. 10 In the above method, in step 2), acquiring the instant metric parameter values of each of the adapters includes obtaining, from the Layer 2 adapter driver, various indices of a Layer 2 adapter link channel, including average packet transmission time, link rate and packet loss rate. In the above method, step 3) includes: 15 Implementing an function on the single metric or calculated composite indices of each Layer 2 adapter obtained in step 2) according to the type and parameter value of the requirements obtained in step 1) to obtain an identifier of the Layer 2 adapter meeting the requirements; wherein, the function is a scalar-type function in the form 20 , wherein I is a single-valued function, and x], x2... x, represent the indices of the Layer 2 adapter. The advantages of the present invention lie in that the Layer 2 adapter selecting system and method in the present invention overcomes the problem of waste of multiple link resources so that the multiple links 25 may be used dynamically in parallel, and also solves the problem of resource waste under the situation of traditional redundant links. 5 Brief Description of the Drawings Fig. 1 is a structural diagram of a Layer 2 adapter selecting system of the present invention; Fig. 2 is a flowchart of a Layer 2 adapter selecting method of the 5 present invention; and Fig. 3 is a schematic diagram of a scenario described in an embodiment. Detailed Description of the Embodiment 10 The present invention will be further described in conjunction with the accompanying drawings now. With reference to Fig. 1, a Layer 2 adapter selecting system of the present invention includes core modules and auxiliary modules, wherein the core modules include a Layer 3 packet requirements extracting 15 module, a destination Layer 2 address acquiring module, a Layer 2 adapter metric acquiring module and an appropriate Layer 2 adapter identifier selecting module; and the auxiliary modules include a packet caching module and a packet scheduling module. The packet caching module is configured to cache a received Layer 20 3 packet. The Layer 3 packet requirements extracting module is configured to read the Layer 3 packet from the packet caching module, extract the type of and parameter value of the requirements from the Layer 3 packet and transmit the obtained results to the appropriate Layer 2 adapter identifier 25 selecting module. Wherein, the requirements refers to indices to be satisfied for the packet transmission, such as the shortest transmission time, the maximum bandwidth and lowest packet loss rate, or 6 transmission time threshold, bandwidth threshold and packet loss rate threshold, or a function value obtained after each of the parameters are calculated, and the like. The Layer 2 adapter metric acquiring module is configured to 5 acquire instant metric parameter values of each of the adapters and transmit the obtained results to the appropriate Layer 2 adapter identifier selecting module. The appropriate Layer 2 adapter identifier selecting module calculates an adapter identifier and a Layer 3 packet metric according to 10 the type and parameter value of the requirements calculated by the Layer 3 packet requirements extracting module and each adapter metric value calculated by the Layer 2 adapter metric acquiring module, transmits the adapter identifier and the Layer 3 packet metric to the packet scheduling module, determines the link corresponding to the adapter is a 15 unidirectional link or a bidirectional link according to the obtained adapter identifier, and if the link is a unidirectional link, then performs parameter negotiation through a bidirectional link so as to obtain a unidirectional link destination address mapping parameter, and sends the mapping parameter to an external destination Layer 2 adapter through the 20 bidirectional link, so that the destination can implement a receiving operation. However, if the link is a bidirectional link, the parameter negotiation operation is not needed. The destination Layer 2 address acquiring module is configured to acquire a Layer 2 address of each of the adapters associated with a 25 destination Layer 3 address. When the destination Layer 2 address acquiring module acquires the Layer 2 address of a destination adapter, if a data link is a bidirectional link, the a source adapter interacts with the 7 destination adapter through a Layer 2 data frame to obtain the Layer 2 address of the destination adapter; and if a data link is a unidirectional link, then the source and destination of another bidirectional link perform parameter negotiation to obtain a mapping parameter of the unidirectional 5 link destination, after which the source transmits the mapping parameter of the unidirectional link destination to the destination through the bidirectional link. The packet scheduling module calls an external Layer 2 adapter driver according to the adapter identifier and Layer 3 packet metric 10 obtained by the appropriate Layer 2 adapter identifier selecting module, and the Layer 2 adapter driver performs the packaging and sending of the packet. The Layer 2 adapter selecting system of the present invention has been described above, and a corresponding Layer 2 adapter selecting 15 method will be illustrated below based on the system in conjunction with Fig. 2. Step 1): after a Layer 3 packet is received, extracting a requirements from the received Layer 3 packet to obtain the type and the parameter value of the requirements; 20 the requirements refers to indices to be satisfied for the packet transmission, such as the shortest transmission time, the maximum bandwidth and lowest packet loss rate, or transmission time threshold, bandwidth threshold and packet loss rate threshold, or a function value obtained after each of the parameters are calculated, and the like. 25 step 2): acquiring the instant metric parameter values of each of the adapters; step 3): calculating an adapter identifier and a Layer 3 packet metric 8 according to the type and parameter value of the requirements obtained in step 1) and the metric parameter values of each of the adapters obtained in step 2); step 4): scheduling the Layer 3 packet according to the adapter 5 identifier and Layer 3 packet metric obtained in step 3) so as to call a corresponding Layer 2 adapter driver; step 5): judging the link corresponding to each of the adapters is a unidirectional link or a bidirectional link, if the link is a unidirectional link, executing step 6), otherwise, executing step 7); 10 step 6): performing parameter negotiation through the source and the destination of a bidirectional link to obtain a unidirectional link destination address mapping parameter, after which the source sending the obtained address mapping parameter to a destination Layer 2 adapter through the bidirectional link, and then executing step 8); 15 step 7): the source adapter and the destination adapter interacting with each other through a Layer 2 data frame, so as to obtain a Layer 2 address of the destination adapter; step 8): the Layer 2 adapter driver of the source adapter performing the packaging and sending of the packet. 20 The present method has been described in general as above, and some of the steps therein will be described further in the following. Step 1) includes: step 1-1): extracting the requirements field from the header of the Layer 3 packet; 25 step 1-2): extracting the type of the requirements from the requirements field, and if the requirements is of a single type, then decomposing the requirements field to obtain a single parameter; and if 9 the requirements is of a composite type, then decomposing the requirements field to obtain a plurality of parameters, further running an algorithm involving each of the obtained parameters to obtain a single dimensionless value. 5 Step 2) includes: obtaining, from the Layer 2 adapter driver, various indices of a Layer 2 adapter link channel, including average packet transmission time, link rate and packet loss rate. Step 3) includes: Implementing an function on the single metric or calculated 10 composite indices of each Layer 2 adapter obtained in step 2) according to the type and parameter value of the requirements obtained in step 1) to obtain an identifier of the Layer 2 adapter meeting the requirements; wherein, the function is a scalar-type function in the fowherein is asingle-valued function, and x 1 , 15 x2... x, represent the indices of the Layer 2 adapter. The Layer 2 adapter selecting method of the present invention will be illustrated below in conjunction with a scenario of Fig. 3. In this scenario, the source is provided with three adapters A1, A2 and A3, which are 802.11b(WiFi) modulator, DOCSIS 1.0 modulator and unidirectional 20 HFC QAM modulator respectively, whose interface rates are 11Mbps, 30Mbps and 38Mbps respectively. Assuming the Layer 3 packet is an IP packet (may also be another type, such as IPX), the requirements, such as the maximum bandwidth (the bandwidth is taken as an example for illustration in this example), is extracted from the COS field of the IP 25 header, then the bandwidth parameters obtained from the Layer 2 adapters are 11Mbps, 30Mbps and 38Mbps. By comparing the maximum bandwidth requirements and the bandwidth parameters, adapter A3 is 10 selected, so the adapter identifier is A3. At the same time, adapter A3 is decided as connected to a unidirectional link, so corresponding unidirectional received parameters (such as a frequency point and a PID, the process of determining these parameters relates to negotiation of a 5 bidirectional adapter such as the A2 and a destination adapter) of a destination are transmitted to the destination through the bidirectional adapter A2, thereafter the IP packet is sent to the adapter A3, which will encapsulate and send the Layer 2 packet. It should be noted that the preceding embodiments are merely used 10 for illustrating the technical solutions of the present invention, rather than limiting the present invention. Though the present invention is illustrated in detail with reference to the preceding embodiments, it should be understood by those of ordinary skill in the art that modifications or equivalent substitutions may be made to the technical solutions of the 15 present invention, and these modifications or substitutions do not depart from the spirit and scope of the technical solutions of the present invention and should fall into the scope of the claims of the present invention i
    权利要求:
    Claims (7)
    [1] 1. A Layer 2 adapter selecting system, including: a Layer 3 packet requirements extracting module, a destination Layer 2 address acquiring 5 module, a Layer 2 adapter metric acquiring module, an appropriate Layer 2 adapter identifier selecting module, a packet caching module and a packet scheduling module; wherein, the packet caching module is configured to cache a received Layer 3 packet; 10 the Layer 3 packet requirements extracting module is configured to read the Layer 3 packet from the packet caching module, extract the type and parameter value of a requirements from the Layer 3 packet and transmit the obtained results to the appropriate Layer 2 adapter identifier selecting module; 15 the Layer 2 adapter metric acquiring module is configured to acquire instant metric parameter values of each of the adapters and transmit the obtained results to the appropriate Layer 2 adapter identifier selecting module; the appropriate Layer 2 adapter identifier selecting module calculates an 20 adapter identifier and a Layer 3 packet metric according to the type and parameter value of the requirements calculated by the Layer 3 packet requirements extracting module and each adapter metric value calculated by the Layer 2 adapter metric acquiring module, transmits the resulted adapter identifier and the Layer 3 packet metric to the packet scheduling 25 module, determines the link corresponding to the adapter is a unidirectional link or a bidirectional link according to the obtained adapter identifier, and if the link is a unidirectional link, then performs 12 parameter negotiation through a bidirectional link to obtain a unidirectional link destination address mapping parameter, and transmits the mapping parameter to an external destination Layer 2 adapter through the bidirectional link; 5 the destination Layer 2 address acquiring module is configured to acquire a Layer 2 address of each of the adapters associated with a destination Layer 3 address; the packet scheduling module calls an external Layer 2 adapter driver according to the adapter identifier and Layer 3 packet metric obtained by 10 the appropriate Layer 2 adapter identifier selecting module, wherein the Layer 2 adapter driver performs packaging and sending of the packet.
    [2] 2. The Layer 2 adapter selecting system according to claim 1, when the destination Layer 2 address acquiring module acquires the Layer 2 address of a destination adapter, if a data link is a bidirectional link, then 15 a source adapter interacts with the destination adapter through a Layer 2 data frame to obtain the Layer 2 address of the destination adapter; and if a data link is a unidirectional link, then the source and destination of another bidirectional link perform parameter negotiation to obtain a mapping parameter of the unidirectional link destination, after which the 20 source transmits the mapping parameter of the unidirectional link destination to the destination through the bidirectional link.
    [3] 3. The Layer 2 adapter selecting system according to claim 1, the requirements is a metric to be satisfied for the packet transmission.
    [4] 4. A Layer 2 adapter selecting method implemented on the Layer 2 25 adapter selecting system as in claims 1-3, including: Step 1): after a Layer 3 packet is received, extracting the requirements from the received Layer 3 packet to obtain the type and the parameter 13 value of the requirements; step 2): acquiring the instant metric parameter values of each of the adapters; step 3): calculating an adapter identifier and a Layer 3 packet metric 5 according to the type and parameter value of the requirements obtained in step 1) and the metric parameter values of each of the adapters obtained in step 2); step 4): scheduling the Layer 3 packet according to the adapter identifier and Layer 3 packet metric obtained in step 3) so as to call a 10 corresponding Layer 2 adapter driver; step 5): judging the link corresponding to each of the adapters is a unidirectional link or a bidirectional link, if the link is a unidirectional link, executing step 6), otherwise, executing step 7); step 6): performing parameter negotiation through the source and the 15 destination of a bidirectional link to obtain a unidirectional link destination address mapping parameter, after which the source sending the obtained address mapping parameter to a destination Layer 2 adapter through the bidirectional link, and then executing step 8); step 7): the source adapter and the destination adapter interacting with 20 each other through a Layer 2 data frame, so as to obtain a Layer 2 address of the destination adapter; step 8): the Layer 2 adapter driver of the source adapter performing the packaging and sending of the packet.
    [5] 5. The method according to claim 4, wherein step 1) includes: 25 step 1-1): extracting the requirements field from the header of the Layer 3 packet; step 1-2): extracting the type of the requirements from the requirements 14 field, and if the requirements is of a single type, then decomposing the requirements field to obtain a single parameter; and if the requirements is of a composite type, then decomposing the requirements field to obtain a plurality of parameters, further running an algorithm involving each of 5 the obtained parameters to obtain a single dimensionless value.
    [6] 6. The method according to claim 4, wherein in step 2), acquiring the instant metric parameter values of each of the adapters includes obtaining, from the Layer 2 adapter driver, various indices of a Layer 2 adapter link channel, including average packet transmission time, link rate and packet 10 loss rate.
    [7] 7. The method according to claim 4, wherein step 3) includes: Implementing an function on the single metric or calculated composite indices of each Layer 2 adapter obtained in step 2) according to the type and parameter value of the requirements obtained in step 1) to obtain an 15 identifier of the Layer 2 adapter meeting the requirements; wherein, the function algorithm is a scalar-type function in the form, wherein is a single-valued function, and x 1 , x2... x, represent the indices of the Layer 2 adapter. 20 15
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    US20150180770A1|2015-06-25|
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    法律状态:
    2014-09-18| DA3| Amendments made section 104|Free format text: THE NATURE OF THE AMENDMENT IS: AMEND THE INVENTION TITLE TO READ LAYER 2 ADAPTER SELECTING SYSTEM AND METHOD |
    2015-09-17| FGA| Letters patent sealed or granted (standard patent)|
    2017-07-27| MK14| Patent ceased section 143(a) (annual fees not paid) or expired|
    优先权:
    申请号 | 申请日 | 专利标题
    CN201210544561.9A|CN103873391B|2012-12-14|2012-12-14|A kind of two layers of adapter select system and method|
    CN201210544561.9||2012-12-14||
    PCT/CN2012/087895|WO2014089888A1|2012-12-14|2012-12-28|System and method for selecting layer-2 adapter|
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